Rate

None

Regularity

Unidentifiable

P waves

May be present

PRI

None

QRS

None

 
Rate

< 40

Regularity

Regular

P waves

None

PRI

None

QRS

> 0.12; bizarre

 
Rate

40-100

Regularity

Regular

P waves

None

PRI

None

QRS

> 0.12; bizarre